Weetos box - mistake on 500g box, but not on 375g box. What's that all about?

[lou031205]

A 500g box of Weetos had the text "...kids cereals...". I dutifuly emailed Weetabix (but didn't receive a reply). Then I bought a 375g box, which had the text "...kid's cereals...".

Surely, as the design is identical, the text would be too?

Also, should it be kids' cereals - cereals for kids not one kid? Unless the context is "make sure your kid's cereal is healthy"?